Improvement in the machine for turning the heads of wood screws and rivets



- come dull from use.

l w UNITED STATES PATENT OFFICE,

HENRY CRUM, OF CLARKSTOWN, NEW YORK.

IMPROVEMENT IN THE MACHINE FOR TURNING THE HEADS OF WOOD SCREWS AND RIVETS. x

Specification forming part of Letters Patent No. 1,411, dated November 16, 1839.

To all whom it may concern:

Beit known that I, HENRY CRUM, of Clarkstown, in the county of Rockland, in the State of New York, have invented a new and Improved Machine for Turning the Heads of Wood Screws and Rivets; and I do hereby declare that the following is a f-ull and exact description thereof.

Figure 1- in the accompanying drawings is a perspective, and Fig. 2 a top View, of the machine. f

In each of the drawingswhere the same parts are shown they are designated by the same numbers or letters of reference.

1 is the-feed-wheel which is to contain the screws the heads of which are to be turned. The shanks of p these are passed through holes prepared to receive them in the periphery of this wheel.` The under parts of the heads are thus brought intocontact with countersunk steel dies, which are uted or ribbed, so as to present sharp cutting-edges to the under side of the head. These dies are to be let into the periphery of the wheel, so as to be renewed at pleasure when they be- In Fig. 3,10 is one of `-these dies, exhibiting the iutes in the countersink and the manner in which it may be let into the wheel. The standard a sustains the chisel by which the heads ofv the screws are to be turned. Y

14 is a piece which swivels on a stout pin, the head of which is shown at b. To

this swivel is attached a socket,'which holds the chisel c, by whichl the heads are to be turned, and which may be so formed as to turn the edges also, or, in preference, carry a second chisel for that purpose, which second chisel may, if preferred, be on a separate stock. The chisel is withdrawn after the head has been turned to allow the wheel 1 to revolve and bring another head in place to be turned, the lower part of the cranked shaft, which embraces the wheel 1.,. being seen at 15, and the screw c in the standard a constituti'ng one of the centers upon which it vibrates.A

No. 44: is a spout, into which the screws which have been finished fall by their gravity and are conducted o.

The tongs 18, attached to the. spindle d d, are for clinching the screw and holding it while it is being whirled round by a band passing around the whirl 42. K

The closing of the jaws for the purpose of clinching the screw to be turned is edected in the following manner: 19 is what I denominate a conical wedge. This conical wedge tits onto the'spindle d, having` a hole through it to receive the spindle, which is .I cylindrical, allowing the conical wedge .to-

slide or turn freely upon it. 20 is a rod inserted through the handles of the tongs and surrounded at each end by spiral springs, which, acting upon them, serve to open them when the conical wedge is withdrawn from between. The cross-bar 21, the front sway-l bar 22, the, pulley 23, the lever 24, and the weight 25, are for forcing the conical wedge between the handles and closing the jaws of the tongs. A collet 43 is placed on the spindie d immediately back of the cross-bar 21 and xed in its place by means of a tightenring-screw for the purpose of aiding in drawing the spindle back by the action of the sway-bar 22. l26 is a slide-bar, which is forced back by means of a cam 27 on the tumbling-shaft 4, e being a center screw in the standard e, which supports one end of this shaft, the shaft itself being distinctly shown in the top view,Fig. 2. The sway-bark 22 is made capable of adjustment as regards its distance from the feed-wheel 1, in lorder to adapt the tongs 18 to screws of diterent lengths. f f f are openings to receive its journals f. The. frame 35, which confines these journals down, may be raised and the sway-bar shifted. The nut on the long screw on the sliding bar 26 adapts this bar to the required distances. The collet or socket 36, against which the back sway-bar operates, must also be adjusted to accord with the other parts.v The back sway-bar 28, the lever 29, and weight 30 are for urging the spindle forward when it is at liberty to move in that direction. l

To enable the spindle to conform itself to those deviations from truth in the screw which are unavoidable, and which will produce some wabbling when it is held by the tongs, I allow the collar g to have some play upward downward, and laterally in the puppet vor standard h. For this purpose itis suspended between spiral springs at each of its sides, as

at 31, 32, 33, and 34. Y

To operate the tumbling-shaft 4 and the cams and other parts with which it is con-r nected, I employ asecondspindle or shaft h, Fig. 2,. which carries the endless screw or worm z and is turned by a band on thewhirl 37. This worm gears into the cog-wheel 38, which is loose on the tumbling-shaft 4; butit has a pin on one side of it, which comes in contact with a similar pin on one side of the ratchet-wheel 39, which is firmly fixed on the shaft. jj are pawls which serve to check the ratchetwheel in the usual manner. Wh en the worm or endless screw has brought the pin on the cog-wheel 38 into contact with that on the ratchet-wheel 39, the latter, being permanent y on the shaft, turns said shaft 4, which previ' ously was dormant,1intil the weight 40 upon an g arm attached to the tumbling-shaft rises and passes beyond a point vertical to the tumbling-shaft, when it falls over by its own gravity and is ready to be again acted on by the endless screw. During the time' of the falling of the weight 40 the following movements take place, and the screw fed into the v ange-wheel 1 nextsucceeding that the head of which has been turned is brought into place to undergo theV same operation: The cam 3 on the tumblingeshaft 4 raises the lever 1,6, which leverbeing attached to the shaft 15, called the `crankshaft, and before spoken of, this turns the swivel 14 (to which it is connected)Y a short distance, suiicient to free the chisel from the head of the screw. A small cam on` the'tumblingshaft 4 comes at the same time in contact with the rod. 10 and draws it back ashort distance, carryingV with itthe sprIng-catch 9, the rod being attached to it forthat purpese. This unlatches the latch 8, whichis attached to the shaft 7. The point on the lever 2, which Vfallsinto the divisions on the feed-wheel 1, is then withdrawn by the action4 of a forked spring, which turns thev shaftf7. In the meantime the cam 27 on the shaft 4 comes into contact with the sliding bar 26, drawing said bar back, and with it,

the front sway-bar22,and withdrawing by this means the conical wedge 19 from between the handles of the tongs, which then open .by the action of the spiral springs before4 described. The upper end ofthe sway-bar carries the spindle d d and the tongs back to the proper distance by the aid of the collet 43.

The flange or feeding wheel beingnow freev to move, in consequence of the removal of the chisel and thel drawingback of the spindle and of the freeing of the Apoint which holds in the divisions of the feed-wheel, that wheel is moved round to the requisite distance by the raising of the lever 5 by the cam3. The

vertical arm. 11 upon and attached to this4 lever advances the ratchet-rod 12, jointed to it, and pushes the ratchet-wheel 13, which is and its appendages.

fixed on the shaft of the feed-wheel, the distance of "one division. The short arm 5 on the lever 5 at the same time forces down the Vpiece 6, which is attached to the shaft 7 com- `position-that is to say, the spindle is propelled forward by the back sway-bar 25 and weight 30. The tongs close on the screw by the conical wedge Vbeing forced between the handles of 4the tongs by the front sway-bar The chisel is made to press upon the head of the screwA situated within the iluted or ribbed 'countersu'nk dies in the feed-Wheel, this being effected by means of the crank 1'5, the lever 5, and the weight 17, as before indicated. As the screw revolves by the revolution of the shaft a a the conical or under part of the head is smoothed by the ribs or iiutes, while its upperor flat part-is turned by the chisel, on the completion of p which the tumbling-shaft is carried round by the weight, and thesame routine recommences.

What l claim as myinvention in the abovedescribed machine, and desire to secu-re by.` Letters Patent, is-A 1. The manner in which Ioperate the tum,

bling-shaft by the operation -ot 'the endless screw and cog-wheehso as to give the requisite motions to the respective parts withl which it is connected, as set forth.

V2. The mode of combining the feed or'iange wheel with the chisel, the swivel 14, andthe l, crank 15 .for turning the heads o'f the screws f and producing the auxiliary motions neces- ,l

sary to the completion of that operation, as'

described.A -1

3. The inserting of ribbed or'l-uted steel dies intov the periphery of the feed-wheel, said dies being count-ersunkl and provided. with sharp cutting-edges, for. the pur-posent' turning the under sides of the screw-heads.

4. The manner of closing the tongs which hold the screw to beturned by means of the conical Wedge, and the combination of the cam 27 and sliding bar 26, with its adjustments.

5. The mannen-of suspending the# main spindle to enable it to conform to the inequalities of the screw by the aidof spiral or other springs operating on each of its respective sides, as described, so that it may yield both vertically and laterally. ,I' do not claim the"allowing it to yield in two directions only..

`Witnesses:

JAMES TAYLOR, JOSEPH CRUM.

HENRY CRUM. 

